Percentage of assumed premiums written by the entity to net premiums written.

No definition available.

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Namespace Prefix:	awh_
Data Type:	num:percentItemType
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- Definition

Amount of written premiums assumed from other entities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 605

-Section 50

-Paragraph 1

-Subparagraph (b)(2),(c)(2)

-URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of written premiums ceded to other entities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 17

-Article 12

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 605

-Section 50

-Paragraph 1

-Subparagraph (b),(c)(2)

-URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547

+ Details

Name:	us-gaap_CededPremiumsWritten
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount, before premiums ceded to other entities and premiums assumed by the entity, of premiums written.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 17

-Article 12

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 605

-Section 50

-Paragraph 1

-Subparagraph (b),(c)(1)

-URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547

+ Details

Name:	us-gaap_DirectPremiumsWritten
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums written.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 17

-Article 12

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 605

-Section 50

-Paragraph 1

-Subparagraph (b),(c)

-URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

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Period Type:

Schedule IV - Supplementary Reinsurance Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reinsurance Premiums for Insurance Companies, by Product Segment, Net Amount [Abstract]
Gross									$ 1,996,831us-gaap_DirectPremiumsWritten	$ 1,804,910us-gaap_DirectPremiumsWritten	$ 1,569,021us-gaap_DirectPremiumsWritten
Ceded to other companies	137,948us-gaap_CededPremiumsWritten	139,142us-gaap_CededPremiumsWritten	206,481us-gaap_CededPremiumsWritten	129,779us-gaap_CededPremiumsWritten	164,360us-gaap_CededPremiumsWritten	127,816us-gaap_CededPremiumsWritten	183,978us-gaap_CededPremiumsWritten	142,029us-gaap_CededPremiumsWritten	613,350us-gaap_CededPremiumsWritten	618,183us-gaap_CededPremiumsWritten	491,448us-gaap_CededPremiumsWritten
Assumed from other companies									938,594us-gaap_AssumedPremiumsWritten	933,754us-gaap_AssumedPremiumsWritten	760,250us-gaap_AssumedPremiumsWritten
Net amount	427,795us-gaap_PremiumsWrittenNet	568,742us-gaap_PremiumsWrittenNet	553,924us-gaap_PremiumsWrittenNet	771,614us-gaap_PremiumsWrittenNet	391,130us-gaap_PremiumsWrittenNet	453,077us-gaap_PremiumsWrittenNet	581,222us-gaap_PremiumsWrittenNet	695,052us-gaap_PremiumsWrittenNet	2,322,075us-gaap_PremiumsWrittenNet	2,120,481us-gaap_PremiumsWrittenNet	1,837,823us-gaap_PremiumsWrittenNet
Property and casualty
Reinsurance Premiums for Insurance Companies, by Product Segment, Net Amount [Abstract]
Gross									1,996,831	1,804,910	1,569,021
Ceded to other companies									613,350	618,183	491,448
Assumed from other companies									938,594	933,754	760,250
Net amount									$ 2,322,075	$ 2,120,481	$ 1,837,823
Percentage of amount assumed to net									40.00%	44.00%	41.00%